Well, for one, Psyren was pretty predictable. Second, the story was kind of boring to say the least. It had its best and most interesting points near to the beginning then started to get rather monotonous with the plot of every arc. The Whole Chrono-Trigger homage mixed with some Lost-world/GANTZ was pretty cool. But I guess the Mangaka was doing up the story as it went.

I personally felt the Manga was pretty boring. only worth reading up till the third arc personally. Dead characters should remain dead.